模拟空间环境条件对洁净室微生物的影响
Chelsi D Cassilly1, Atul M Chander2, Jason A Vaughn1
1NASA Marshall Space Flight Center, Materials and Processes Laboratory, Huntsville, AL, United States.
Frontiers in microbiology
|September 4, 2025
概括
美国国家航空航天局的清洁室里有耐太空环境的细菌. 这些发现挑战了目前以子为中心的污染评估,并为未来的太空任务提供了行星保护策略.
科学领域:
- 天体生物学和空间微生物学
- 保护地球
- 基因组学和微生物生态学
背景情况:
- 微生物污染对NASA任务构成重大风险,影响材料完整性,环境保护,科学数据可靠性和机组人员健康.
- 现有的清洁和杀菌方案需要改进, 以尽量减少对太空探索的微生物影响.
- 了解微生物弹性对于开发先进的生物负担控制策略至关重要.
研究的目的:
- 识别和描述来自NASA清洁室的耐受性微生物菌株.
- 评估这些微生物对模拟空间环境压力因素的抵抗力.
- 分析微生物弹性的基因组基础, 以改善地球保护.
主要方法:
- 在马歇尔太空飞行中心的清洁室和不受控制的空间采样空气和表面.
- 82种微生物菌株的隔离,表征和应力测试 (干燥,真空,质子,紫外线辐射).
- 四种高耐药性非子形成物种的全基因组测序和比较基因组分析.
主要成果:
- 四种不形成子的物种 (Arthrobacter koreensis PPS68,Paenarthrobacter sp. 标签:PPS72,Mycetocola sp. 标签:PPS72,Mycetocola sp. 标签: 艾尔维尼亚 sp. PPS120) 对空间压力因素具有很高的抵抗力.
- 基因组分析揭示了氨基酸生物合成,碳水化合物代谢和应激反应的基因,包括氧化应激和DNA修复.
- Arthrobacter koreensis PPS68表现出独特的干燥和辐射弹性基因特征,包括DNA修复和奥斯莫保护基因.
结论:
- 清洁室中的耐性非子形成细菌具有适应性,能够在极端的空间条件下生存.
- 目前以子为中心的生物负担测定可能不足以提供全面的行星保护.
- 基因组数据和压力测试为太空任务的微生物风险评估和消毒设计提供了宝贵的资源.
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